1. Introduction
This manual provides essential information for the installation, operation, and maintenance of the sea jump 8PCS Propeller set, designed specifically for U38, U39, and D68 Brushless Motor Folding Quadcopters. These propellers are crucial spare parts for RC Aerial Photography Drones, ensuring continued flight capability.

Figure 1.1: Overview of the 8-piece propeller set.
2. Product Description and Features
The sea jump U38 U39 D68 UAV Propellers are high-quality, durable, and foldable replacement blades designed for specific drone models. They are engineered to be robust and resistant to breakage, ensuring reliable performance for your quadcopter.
- Compatibility: Specifically designed for U38, U39, and D68 UAV models.
- Durability: Constructed from high-quality materials to ensure longevity and resistance to damage during normal use.
- Foldable Design: Features a convenient folding mechanism, making them easy to transport and store without occupying much space.
- Lightweight: Each single blade weighs approximately 3.5g, contributing to the drone's overall light weight and agile flight characteristics.
- Easy Identification: Each propeller is clearly marked with "A" or "B" for easy distinction between clockwise (CW) and counter-clockwise (CCW) rotation types, simplifying installation.
- Comprehensive Set: The package includes 8 propellers (4 CW and 4 CCW), providing sufficient spare parts to ensure continuous drone operation.

Figure 2.1: Folded propellers for compact storage.

Figure 2.2: Unfolded propellers ready for installation.
3. Setup and Installation
Proper installation of the propellers is essential for safe and stable drone flight. Follow these steps carefully:
- Identify Propeller Type: Each propeller is marked with either "A" or "B". These markings correspond to the specific motor arm on your drone. "A" propellers are typically for clockwise rotation, and "B" for counter-clockwise rotation.
- Match to Drone Arms: Refer to your drone's original manual or the markings on the drone's motor arms to determine which type of propeller (A or B) goes on each specific arm. Incorrect placement can lead to unstable flight or inability to take off.
- Secure Installation: Align the propeller with the motor shaft and gently push down until it clicks into place or is securely fastened according to your drone's design (some may require screws). Ensure the propeller is firmly attached and does not wobble.
- Verify Rotation: After installation, manually spin each propeller to ensure it rotates freely without obstruction. Double-check that the "A" and "B" propellers are on the correct motor arms as per your drone's requirements.

Figure 3.1: Propeller installation guide, showing A and B markings and their corresponding drone arm positions.

Figure 3.2: Detailed view of 'A' and 'B' propeller markings.
Important Note: Always confirm your drone model before purchasing and installing propellers to ensure compatibility and avoid mismatch.
4. Operating Considerations
These propellers are integral components of your U38, U39, or D68 quadcopter's flight system. Once correctly installed, they work in conjunction with the drone's brushless motors to generate lift and thrust. Ensure all propellers are free from damage and properly secured before each flight to maintain optimal performance and safety.
- Pre-Flight Check: Before every flight, visually inspect each propeller for any cracks, bends, or debris.
- Balanced Flight: Damaged or unbalanced propellers can lead to unstable flight, reduced battery life, and increased strain on motors. Replace any damaged propellers immediately.
5. Maintenance
To ensure the longevity and optimal performance of your propellers, follow these maintenance guidelines:
- Cleaning: Periodically clean the propellers with a soft, dry cloth to remove dust, dirt, or any accumulated debris. Avoid using harsh chemicals that could damage the material.
- Inspection: Regularly inspect the propellers for any signs of wear, cracks, chips, or deformation. Pay close attention to the propeller tips and the mounting hub.
- Storage: When not in use, store the propellers in a clean, dry place, away from direct sunlight and extreme temperatures. The foldable design aids in compact storage.
- Replacement: Replace propellers immediately if any damage is observed, even minor. Using damaged propellers can compromise flight safety and drone stability.
6. Troubleshooting
This section addresses common issues related to propeller usage:
| Problem | Possible Cause | Solution |
|---|---|---|
| Drone unstable during flight / Vibrations | Damaged, bent, or unbalanced propeller; Incorrect propeller type (A/B) installed on an arm. | Inspect all propellers for damage and replace if necessary. Verify that "A" and "B" propellers are installed on the correct motor arms as per your drone's manual. |
| Drone not taking off / Flipping on takeoff | Incorrect propeller installation (A/B swapped); Propellers not securely attached. | Double-check that each propeller is on its designated motor arm (A on A, B on B). Ensure all propellers are firmly clicked or screwed into place. |
| Propeller detaches during flight | Improper installation; Worn mounting mechanism on propeller or motor. | Ensure propellers are fully seated and secured. If the issue persists with new propellers, inspect the drone's motor shafts for wear. |
7. Specifications
| Attribute | Detail |
|---|---|
| Product Name | U38 U39 D68 UAV Propeller |
| Compatibility | U38, U39, D68 UAV |
| Product Features | Foldable, Easy to Install, High Quality, Durable |
| Single Blade Weight | Approximately 3.5g |
| Package Weight (one set) | 15g |
| Package Dimensions | 11.71 x 7.49 x 2.31 cm |
| Included in Package | 4 x CW Propellers, 4 x CCW Propellers (Total 8 PCS) |
| Model Number | U38 |
8. Warranty and Support
For any questions, concerns, or support regarding your sea jump U38 U39 D68 UAV Propellers, please contact the seller or manufacturer directly through the platform where the purchase was made. Please refer to your purchase documentation for specific warranty terms, if applicable.
It is recommended to retain your proof of purchase for any warranty claims or support inquiries.